package com.nowcoder.community.community.service;

import com.nowcoder.community.community.dao.CommentMapper;
import com.nowcoder.community.community.entity.Comment;
import com.nowcoder.community.community.util.CommunityConstant;
import com.nowcoder.community.community.util.SensitiveFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.util.HtmlUtils;

import java.util.List;

@Service
public class CommentService implements CommunityConstant {

    @Autowired
    private CommentMapper commentMapper;

    @Autowired
    private SensitiveFilter sensitiveFilter;

    @Autowired
    private DiscussPostService discussPostService;

    /**
     * 查询评论，并分页
     * @param entityType
     * @param entityId
     * @param offset
     * @param limit
     * @return
     */
    public List<Comment> findCommentsByEntity(int entityType,int entityId,int offset,int limit){
        return commentMapper.selectCommentsByEntity(entityType,entityId,offset,limit);
    }

    /**
     * 查询评论数量
     * @param entityType
     * @param entityId
     * @return
     */
    public int findCommentCount(int entityType,int entityId){
        return commentMapper.selectCountByEntity(entityType,entityId);
    }

    /**
     * 添加评论,修改评论数量
     * @param comment
     * @return
     */
    @Transactional(isolation = Isolation.READ_COMMITTED,propagation = Propagation.REQUIRED)
    public int addComment(Comment comment){
        if(comment == null){
            throw new IllegalArgumentException("参数不能为空！");
        }

        // 过滤内容，并添加评论
        comment.setContent(HtmlUtils.htmlEscape(comment.getContent()));
        comment.setContent(sensitiveFilter.filter(comment.getContent()));
        int rows = commentMapper.insertComment(comment);

        // 更新帖子的评论数量
        if(comment.getEntityType() == ENTITY_TYPE_POST){
            int count = commentMapper.selectCountByEntity(comment.getEntityType(),comment.getEntityId());
            discussPostService.updateCommentCount(comment.getEntityId(),count);
        }

        return rows;
    }

    /**
     * 查询指定用户回复的帖子id(entity_id)
     * @param userId
     * @return
     */
    public List<Comment> findCommentsByUserId(int userId, int offset, int limit){
        return commentMapper.selectCommentsByUserId(userId, offset, limit);
    }

    /**
     * 查询指定用户回复的帖子的数量
     * @param userId
     * @return
     */
    public int findCommentCountByUserId(int userId) {
        return commentMapper.selectCommentCountByUserId(userId);
    }

    /**
     * 根据id查询评论
     * @param id
     * @return
     */
    public Comment findCommentById(int id) {
        return commentMapper.selectCommentById(id);
    }

}
